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+//example 3
+//Effect of Boiler Pressure and Temperature on Efficiency
+clear
+clc
+P1=10 //pressure of steam in state 1 in kPa
+P2=3000 //pressure of steam in state 2 in kPa
+P3=3000 //pressure of steam in state 3 in kPa
+P4=10 //pressure of steam in state 4 in kPa
+T3=350 //temp. of state in state 3 in celsius
+h3=3116.1 //specific heat enthalpy in state 3 in kJ/kg
+s3=6.7450 //specific entropy in state 3 in kJ/kg-K
+h1=191.81 //specific heat enthalpy in state 1 in kJ>kg
+v1=0.00101 //specific volume in state 1 in m3>kg
+wpumpin=3.02 //work done by the pump in kJ/kg
+h2=h1+wpumpin //specific heat enthalpy in state 2 in kJ/kg
+s3=6.7450 //specific entropy in state 3 in kJ/kg-K
+s4=s3 //specific entropy in state 4
+sf=0.6492 //in kJ/kg-K
+sfg=7.4996 //in kJ/kg-K
+x4=(s4-sf)/sfg //quality of steam in state 4
+hf=191.81 // kJ/kg
+hfg=2392.1 //kJ/kg
+h4=hf+x4*hfg //specific heat enthalpy in state 4 in kJ/kg
+qin=h3-h2 //heat coming in in kJ/kg
+qout=h4-h1 //heat going out in kJ/kg
+n1=1-qout/qin //thermal efficiency of power plant
+disp('the thermal efficiency if steam is superheated to 600°C instead of 350°C')
+h32=3682.8 //Specific enthalpy in state 3 in kJ/kg
+h42=2380.3 //Specific enthalpy in state 3 in kJ/kg
+qin2=h32-h2 //heat coming in in kJ/kg
+qout2=h42-h1//heat going out in kJ/kg
+n2=1-qout2/qin2 //thermal efficiency under given conditions
+disp('the thermal efficiency if the boiler pressure is raised to 15 MPa while the turbine inlet temperature is maintained at 600°C')
+h23=206.95 //Specific enthalpy in state 2 in kJ/kg
+h43=2115.3 //Specific enthalpy in state 4 in kJ/kg
+h33=3583.1 //Specific enthalpy in state 3 in kJ/kg
+qin3=h33-h23 //heat coming in in kJ/kg
+qout3=h43-h1 //heat going out in kJ/kg
+n3=1-(qout3/qin3) //thermal efficiency under given conditions
+printf("\n Hence, the thermal efficiency of this power plant if the steam is uperheated to 600 C is = %.3f. \n",n1);
+printf("\n Hence, the thermal efficiency of this power plant if the steam is uperheated to 350 C is = %.3f. \n",n2);
+printf("\n Hence, the thermal efficiency if the boiler pressure is raised to 15 MPa while the turbine inlet temperature is maintained at 600°C. is = %.3f. \n",n3);
+\ No newline at end of file